Torque Monster !

mbaird said
Again... this is a theoretical exercise. I am not really going to dump $15k into an old MH engine. We all have an idea of how to build a drag motor. Building a monster engine that has to pull a big load for long periods without overheating or wearing out in short order is a different science.
Besides It would be cool to have a sleeper vintage Mopar MH !

4.25 seems to be the max stroke with out oiling mods. What I am not sure about is the rod length effect/issues as related to dwell time , heat dissipation , piston pin height , piston skirt wear etc ....
Heads for a torque monster don’t need to flow like a drag engine IMO... but a set of modern alloy heads has closed chambers for quench and dissipate heat better . Which means you could up the compression a bit to 9.5 range and still use mid grade fuel.

Yes you don’t need high flow heads for a motor home, I missed that part, Stock heads will flow enough to make the power you need.

Stroking isn’t necessary about torque it’s about moving peak power closer to the operating range this case crusin rpm.

If say your crusin at 1500 rpm the only way to increase hp at that rpm in a NA engine is to increase torque since the rpm is fixed and the main way to gain torque is displacement.

The other way to do it would be to add more gear with stock stroke 440 to cruse at the same hp, either way is gonna add friction “wear” and burn more gas, lower rpm has the advantage of producing less noise.